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<a name="Selectors"></a>
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<a name="Selecting-targets-to-which-a-test-applies"></a>
<h4 class="subsection">7.2.2 Selecting targets to which a test applies</h4>

<p>Several test directives include <var>selector</var>s to limit the targets
for which a test is run or to declare that a test is expected to fail
on particular targets.
</p>
<p>A selector is:
</p><ul>
<li> one or more target triplets, possibly including wildcard characters;
use &lsquo;<samp>*-*-*</samp>&rsquo; to match any target
</li><li> a single effective-target keyword (see <a href="Effective_002dTarget-Keywords.html#Effective_002dTarget-Keywords">Effective-Target Keywords</a>)
</li><li> a logical expression
</li></ul>

<p>Depending on the context, the selector specifies whether a test is
skipped and reported as unsupported or is expected to fail.  A context
that allows either &lsquo;<samp>target</samp>&rsquo; or &lsquo;<samp>xfail</samp>&rsquo; also allows
&lsquo;<samp>{ target <var>selector1</var> xfail <var>selector2</var> }</samp>&rsquo;
to skip the test for targets that don&rsquo;t match <var>selector1</var> and the
test to fail for targets that match <var>selector2</var>.
</p>
<p>A selector expression appears within curly braces and uses a single
logical operator: one of &lsquo;<samp>!</samp>&rsquo;, &lsquo;<samp>&amp;&amp;</samp>&rsquo;, or &lsquo;<samp>||</samp>&rsquo;.  An
operand is another selector expression, an effective-target keyword,
a single target triplet, or a list of target triplets within quotes or
curly braces.  For example:
</p>
<div class="smallexample">
<pre class="smallexample">{ target { ! &quot;hppa*-*-* ia64*-*-*&quot; } }
{ target { powerpc*-*-* &amp;&amp; lp64 } }
{ xfail { lp64 || vect_no_align } }
</pre></div>




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